The Aizu Line was constructed between 1927 and 1953 by the
Japanese National Railways (JNR) as part of a plan to build a direct line from Aizu-Wakamatsu to Tokyo. The Aizu line was the northern section, whilst the
Yagan Railway Aizu Kinugawa Line was to be the southern section. Despite the Kinugawa line connecting to the Aizu line in 1986, the Aizu Line was deemed an unprofitable secondary line and transferred to a company established by local governments in 1987. The Aizukōgen-Ozeguchi - Aizu-Tajima section was electrified at 1500 VDC in 1990 to facilitate through-running onto the Kinugawa line.
Timeline • November 1, 1927: Nishi-Wakamatsu - Ashimomaki-Onsen section (10.5 km) opens • December 22, 1932: Ashimomaki-Onsen - Yunokami-Onsen section opens • December 27, 1934: Yunokami-Onsen - Aizu-Tajima section opens • December 12, 1947: Aizu-Tajima - Nanatsugatake-Tozanguchi section opens • November 8, 1953: Nanatsugatake-Tozanguchi - Aizukōgen-Ozeguchi • December 1, 1980: The 12.2 km deviation between Ashimomaki-Onsen and Yunokami-Onsen opens as part of the construction of the
Okawa Dam • April 1, 1987: Line transferred to
East Japan Railway Company (JR East) upon privatization of JNR • July 16, 1987: Line transferred to Aizu Railway • October 12, 1990: Aizu-Tajima — Aizukōgen-Ozeguchi section electrified (1500 V DC), direct service to the Yagan Railway Aizu Kinugawa Line begins • April 1, 1999:
Japan Freight Railway Company (JR Freight) ends operations • April 22, 2017:
Revaty Aizu uses
Tobu 500 series which belongs to
Tobu Railway has been commenced operating. • March 12, 2022:
Revaty Aizu has been the only electric train as a train, which runs on Aizu Line because Aizu Railway stopped interconnecting with Yagan Railway except for Revaty Aizu. Simultaneously, Aizu Railway lost the only electric train that
Tobu 6050-100 series. == Notes ==